Detachable-blade knife.



MQ PARKER.

DETACHABLE BLADE KNIFE.

Armenio msn Nov. 2r, 1915,

F'g'. E97.

MM j; .fa s

@mmm/vlo@ ml MORGAN YABKER, OF NEWPORT, RHODE ISLAND.

To allie/1.0m it may concern.'

.1.3e it known that l, MORGAN PARKER, a citizen of the United States, residing at Rho e Island, .have invented certain new und useful Improvements in Detachable-V Blade Knives; and I do hereby declare the following to be a full, clear, and exact dev scription of the invention, such' as will en able others skilled in the ert to which it appertains to make and use the seine.'

struction of the devices whereby the blade is detacha'bly held upon the'handle of the knife. The object of the invention is to provide such an improved construction of the handle that a compact, neat', sightl and in.- expensive structure is produced w ich will hold the blade firmly against movement upon the handle and which permits of at taehliilig and detacliing the blade easily and quie y.

The invention may be employed in knives and razors of various types but I have found it to be of special utility in surgical instrumelnts of the type known as surgeons scalne S f- I lhave illustrated the preferred embodiment f my invention inthe accompanying driiwn in which Figure 1. is a perspective view o the knife; Fi 2 is a similar view with the blade partiallzy detacheda Fig. 8 il e perspective view of the end of the handle' Fig. 4 is a. plan view of the handle with the blade thereon; Fi 5 is a longitudinal section onlthe line -5 of Fig. 4i; :ind Figs. 6 and 7 are transverse sections on the lines 6--6 and77 of Fig. 4.;

Referrin to these drawings the' handle of the kni e consists of s han -grip 8 and n blade-support 9 rejecting from the end of the grip. This lade-support at its end adjacent to the grip has a lane surface upon which the inner end oi t e blade bears and beyond this is e projection 10 reused `from the surface of the blade-support, thus formin in effect n connecting portion haw ing a 'iiit bottoni recess between the projection 10 and the hand grip 8. This projection 10 is preferably elongated in the direcition of the length of the knife and provnld with rounded'ends as shown. In the sides f the projectio are grooves 11. These f rooves extend fom the outer end of the Specification of Letters Patent.

New ort, county of Newport, and State of v *."Llliis invention relates to detachable blade, knives and more particularly to the con-- parts by which the binde is held upon the- Patented Dec. 10, 1918.

Appumien med'ivovemeer 27. 1915. seriai no, capii.

projection 10 to a point about midway of the len th of the projection.

The lade is siown :it 12. It consists preferably of thin sheet metal eut to the slm ie best adapted for the use for which the kni e is designed and sharpened at its edge, as is indicated in the drawing. ',lhe bifida has iin opening 13 therein. The portion of this opening 125 adjacent to the inner end of .j=.

the binde corresponds accurate-lr in size, and shape te the corresponding portion of the projection 10, that is, the portion of the projection l0 which is not provided 4with grooves in its sides., The remainder of the opening in thebliido l2 is ot' less width, iis is indicated bythe dotted lines 111 inl Fig. t.

In order to mount the blade upon the handle, the outer end of the projection l0 is introduced into the wider portion of the opening 13 in the binde und the walls of the opening 13 et the point where the width of that opening is decreased ure introduced into.

the grooves ll in the side-s of the projection 10. This is best. done by graspinff the outer @mi of the iliade between on time mi forelinger and the blade is then subjected to a slight rocking movement' which brings the inner end of the blade down upon the top surface of the projection 10 and flexes the blade siigliti m the-.direccion of its length This slig it movement yof the blade is su icient to bring the walls of the nur- 'rower portion of the opening 13 into alineinent with the grooves 11 in the project-ion 10., The blade may then be moved toward the' hand-grip 8` a d the wells of the inn-- rower portion of t opening 13 entered into the grooves 11. While passin throu h this movement', the blade is lexe very s ightly in the direction of i-.a length since a. port-ion of theblade is Leid parallel to the length of the grooves 1l, whereas the inner end of the blade nem' the inner end of the opening 13' bears upon the lop of the projection 10. Theparts are then in the condition in which they are shown in Fig. At the end of the movement of the br.. .le in this direction, this iles-ire of the bleef., is relieved by the inner end of the blade passing over the inner end of the projection 10 and down upon the dat surface between 8 und 10 of the re; cess.

'irmly against movement in any direction in BEST AvAIiABLseoPY when in this cessation, um time@ is heid the lplane in which the blade lies, as the projection 10 lits so snugly in the opening mounted on the handle'this portion 15 willproject beyond the edge of the surface 9 sufficient to, permit of applying lateral pressure thereto with the finger. To remove the -blade from the handle, the extension 15 is moved laterally a slight-amount to flex the blade in the: direction of its length Tan amount sufficient to carry the inner end of the blade above the plane of the top surface of projection 10. Then the blade is moved in the direction of its length until the walls of the narrow portion of the opening 13 are blade to the handle involves flexing the withdrawn from the grooves 11 in the'projection 10.

It will thus be seen that applying) the lade slightly in the. direction of its length to permit coaction of the walls of the narrow portion of slot 13 and the grooves in rejection 10. The blade is held in this flexc( condition while it is being moved to its final position i and then its flcxure'is automatically relieved b the inner endV of the blade droppingover t e end of the projection 10. Then the blade is held firmly as the only movement of which .it ,is capable is abending movement of .the inner end .of the blade against the tension of the blade itself. To remove the bladen it is flexed by such bending movement of its inner end transverse to the plane in which it lies and the blade ma then be moved in the direction of its lengt i to detach'it 'from the handle.

What I claim is:

1. A detachable blade knife com rising, in.

lcombination, a handle having a and-grip and an elon ated blade-holding projection, a flat -flexible lade having an elongated closed slot shaped to closely embrace the projection to prevent movement in all directions in the :lane of the blade, and a tongue and groove interlock normally reventing separation of the blade and hand e but so positioned as to permit a flexing movement of the blade to clear one end of the projection and a subsequent movement of t e flexed blade lengthw'isl of the proj 2. A detachable blade knife comprising, in combination, a handle having a hand grip, and an elon vated pro'ection spaced apart from the han grip an having side grooves extendin from one end of the projection for a part o the length thereof; and a flat flexiection to disengage thcin'ter-` ble blade with a closed slot which has one portion closel surroundin a part of the projection an another portion of restricted width with walls normally fitted in the side ooves to rigidly interlock the blade and iandle against relative movement except when the blade is flexed.

3. A detachable blade knife comprising, in combination a handle havin a hand grip, an elon ated pro'ection, an( a connecting portion avin a fiat bottom between the up-A 'per surface o the projection and the hand grip; and a fiat flexible blade with a closed slot closely embracing the pro'ection to prevent relative movementin all directions in the plane of the blade; the' blade having a pgrtion .which normally rests on said flat tto'm and whichpis capable of transverse flexure, whereby that portion mayy be lifted above the projection to slide the b ade longitudinall f out of engagement therewtli.

4. A detachable blade knife comprising, in combination, a handle having a hand grip, and a blade support with a single elongated projection s ace-d apJart from the hand (grim and a flat exible lade with a close slot embracing the projection and having walls with a part thereof rigidly interlocking with a part of the projection below the upper surface thereof; the blade havin aportion capable of transverse flexure, wiiere y that portion may be lifted above the projection to ongitudinally slide the blade out of engagef ment therewith. i

t. A detachable blade knife comprising, in combination, a handle having a hand grip, and a blade support having on its upper surface an elongated projection with side grooves extending from one end of the projection for a part of the length thereof, and also having a connecting portion with a flat bottom on 'its upper surface between the hand grip and thc inner end of the projection; and a fiat flexible blade having a closed slot embracing the projection and having at one end a. portion of restricted width; the walls-of the restricted portion of the slot rigidly interlocking with the grooves in the projection, and the blade havinga portion which normallyr rests on said fiat bottom and whichis capab e of transverse flejrure, whereby' that portion may be lifted above the projection to slide the blade longitudinally out of engagement therewith.

6. A detachable blade knife com rising, in combination, a hand-grip, a bla e-su )port p rojectin from the end of the grip and provided witi a'flat bottomed recess adjacent the end of said grip, and having attaching means associated with each of its sides, a flat blad? havingan elongated slot extending longitudinal y therein, said slotted blade beingjprovided with a portion adapted to fit aroiuid said blade support and a portion adapted to engage said attaching means, the

.fill

mamon l reoess'in seid suppot receiving the end of `blade support projecting from theend ofthe grip and provided with a liet, bottomed re- `cess adjacent the end of said grip and having a. oove along a portlon of each of its sides2 .10 e lede having an elongated slot extending d longitudinally ther-ein., .elollbengpff# videdwith a portion adapted' wt around, said blade-support and pmfon adapted to lit within the grooved portion of sold sup port, the recess osad suport being' adept- 15 ed to receive the endof 4sei ylolede to permit, the blade to beheld etfupon seidisupport.

1 In testimony whereof I axhmy'signature.

f Menem PARKER.. 

